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  • 1
    Electronic Resource
    Electronic Resource
    Evidence from nitrogen-15 and solvent deuterium isotope effects on the chemical mechanism of adenosine deaminase (1987)
    s.l. : American Chemical Society
    Biochemistry 26 (1987), S. 7378-7384 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00397a027
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Anzahl der Zerlegungen einer ganzen, rationalen Zahl in Summanden, II (1896)
    Springer
    Mathematische Annalen 47 (1896), S. 281-297 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447271
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Anzahl der Zerlegungen einer ganzen rationalen Zahl in Summanden (1894)
    Springer
    Mathematische Annalen 45 (1894), S. 371-380 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01446684
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    Paper (German National Licenses)
    Fulltext
  • 4
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    The Influence of the Indonesian Throughflow on Seychelles-Chagos Thermocline Ridge and the Surface Chlorophyll Bloom (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-30
    Description: The Seychelles-Chagos Thermocline Ridge (SCTR) is a biologically important region of open ocean upwelling within the south west Indian Ocean (5-10°S and 45-90°E). The SCTR refers to an elongated feature which joins two local minima in thermocline depth; the Seychelles Dome (SD) and Chagos Domes (CD). We present the seasonality and physical drivers of the surface chl-a bloom for both the western (SD) and eastern (CD) extremes of the SCTR, using in situ observations and remotely sensed data. We find the buoyancy fluxes from the Indonesian Though Flow (ITF) strongly impacts surface chl-a concentrations over the CD. Here a significant correlation (r=0.33) was found between the altimeter-derived strength of the IFT and the surface chl-a concentrations. This correlation increases (r=0.58) when only the 90th percentile ITF events are considered, indicating the influence of the ITF may be overcoming other physical drivers for these years. We hypothesise the buoyancy flux of a strong ITF input suppresses the thermocline and ‘caps’ the CD with warm, less saline waters. This hypothesis is supported following a strong, significant relationship (r=0.66) between remotely sensed surface salinity and surface chl-a over the CD. This relationship is not found over the SD, where the ITF has a weaker direct impact over the bloom. The results suggest that the ITF may be an important factor for surface chl-a within the SCTR over longer-term time scales. Idealised model experiments will be used to investigate the relationship between the IFT and the spatio-temporal variability chl-a within the SCTR.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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    GFZ OAI
  • 5
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    South Africa’s Floating University SEAmester - An example of a successful ship-based education programme (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-18
    Description: The UN’s Decade of Ocean Science (in particular SDG 4 and 14) calls for programmes that improve scientific knowledge, develop research capacities and transfer marine technological information and expertise across generations. In South Africa, the Department of Science and Innovation’s (DSI) has already taken a significant step forward in such training measures. The current DSI Global Change Grand Challenge programme calls for platforms that “attract young researchers and retain them by exciting their interest in aspects of global change, while developing their capacity and professional skills in the relevant fields of investigation”. To meet these challenges in the Ocean Sciences, SEAmester – South Africa’s Floating University and a joint initiative between Government and Universities was started in 2016. The strength of SEAmester is that South African postgraduate students combine theoretical classroom learning with the application of this knowledge through ship-based, and more importantly, hands-on research through the Agulhas System Climate Array (ASCA) programme. Now into its 6th year, SEAmester has already made significant progress in ship-based training with over 210 students from 23 South African universities participating in these training cruises. This presentation will examine the development of this programme, its success as well as its challenges and most importantly, what has become of the past SEAmester students.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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    GFZ OAI
  • 6
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    Inter-ocean Fluxes south of Africa in an Eddy-permitting Model (2002)
    In:  CLIVAR Exchanges, 25 (7 (3/4)). pp. 10-12.
    Details
    Publication Date: 2015-11-09
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 7
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    Interocean fluxes south of Africa in an eddy-permitting model (2003)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 50 (1). pp. 281-298.
    Details
    Publication Date: 2020-08-05
    Description: Exchanges of water south of Africa between the South Indian Ocean and the South Atlantic Ocean are an important component of the global thermohaline circulation. Evidence exists that the variability in these exchanges, on both meso- and longer time scales, may significantly influence weather and climate patterns in the southern African region and the significance of these regional ocean–atmosphere interactions is discussed. Observations of the inter-ocean exchange are limited and it is necessary to augment these with estimates derived from models. As a first step in this direction, this study uses an eddy-permitting model to investigate the heat and volume transport in the oceanic region south of Africa and its variability on meso, seasonal and inter-annual time scales. On the annual mean, about Full-size image (〈1 K) (standard deviation Full-size image (〈1 K)) of heat flows west into the South Atlantic across 20°E (longitude of Cape Agulhas, the southernmost point of Africa), with just over Full-size image (〈1 K) (standard deviation Full-size image (〈1 K)) flowing north into the South Atlantic across 35°S. The seasonal variations in this transport are about 10% at 35°S in the South Atlantic and around 20% through 20°E; the model value of Full-size image (〈1 K) for summer (standard deviation ranging from Full-size image (〈1 K) in January to Full-size image (〈1 K) in March) appears consistent with respective estimates of 0.51 and Full-size image (〈1 K) derived from two WOCE summer cruises southwest of Cape Town to 45°S in 1990 and 1993. Volume transports of the Agulhas Current section through 35°S in the SW Indian Ocean range from 58 to Full-size image (〈1 K) in summer/autumn to 64–Full-size image (〈1 K) in winter/spring. The model results suggest that the inter-ocean exchange south of Africa is highly variable on seasonal through to interannual scales. If this variability is also the case in the real ocean (and the limited observations suggest that this is so), then there are likely to be significant implications for climate.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0645(02)00385-5
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    A new class of pulsating white dwarf of extremely low mass: the fourth and fifth members (2013)
    Oxford University Press
    Details
    Publication Date: 2013-11-30
    Description: We report the discovery of two new pulsating extremely low-mass (ELM) white dwarfs (WDs), SDSS J161431.28+191219.4 (hereafter J1614) and SDSS J222859.93+362359.6 (hereafter J2228). Both WDs have masses 〈0.25 M and thus likely harbour helium cores. Spectral fits indicate these are the two coolest pulsating WDs ever found. J1614 has T eff  = 8880 ± 170 K and log g  = 6.66 ± 0.14, which corresponds to a ~0.19 M WD. J2228 is considerably cooler, with a T eff  = 7870 ± 120 K and log g  = 6.03 ± 0.08, which corresponds to an ~0.16 M WD, making it the coolest and lowest mass pulsating WD known. There are multiple ELM WDs with effective temperatures between the warmest and coolest known ELM pulsators that do not pulsate to observable amplitudes, which questions the purity of the instability strip for low-mass WDs. In contrast to the CO-core ZZ Ceti stars, which are believed to represent a stage in the evolution of all such WDs, ELM WDs may not all evolve as a simple cooling sequence through an instability strip. Both stars exhibit long-period variability (1184-6235 s) consistent with non-radial g -mode pulsations. Although ELM WDs are preferentially found in close binary systems, both J1614 and J2228 do not exhibit significant radial-velocity variability, and are perhaps in low-inclination systems or have low-mass companions. These are the fourth and fifth pulsating ELM WDs known, all of which have hydrogen-dominated atmospheres, establishing these objects as a new class of pulsating WD.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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    PAPER CURRENT
  • 9
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    A Model Investigation of the Influences of the South‐East Madagascar Current on the South‐East Madagascar Bloom (2020)
    AGU (American Geophysical Union)
    Details
    Publication Date: 2023-02-08
    Description: The South-East Madagascar Bloom, one of the most compelling biogeochemical features of the Indian Ocean, occurs sporadically during austral summer in the oligotrophic waters south-east of Madagascar, where it can cover up to 1% of the global ocean surface area. Its spatial extension and its timing are highly variable. A high-resolution biophysical model is used to investigate a previous hypothesis that the onset of a particular circulation of the South-East Madagascar Current advects fresher and nutrient-rich waters eastward, feeding the bloom. The model is able to reproduce an intermittent phytoplankton bloom with large spatial variability but in the subsurface layers, as well as the presence of an irregular retroflection of the South-East Madagascar Current. The simulated bloom occurs within a shallow stratified mixed layer, with fresher waters at the surface, parallel to the water mass in an observed bloom. The model results suggest, from a nutrient flux analysis, that horizontal advection of low-salinity nutrient-rich Madagascan coastal waters can indeed trigger a phytoplankton bloom. The coupled model is also able to resolve a bloom that is atmospherically forced by cyclonic activity.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    A New Definition of the South‐East Madagascar Bloom and Analysis of Its Variability (2019)
    Wiley | AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 124 (3). pp. 1717-1735.
    Details
    Publication Date: 2022-01-31
    Description: The South-East Madagascar Bloom occurs in an oligotrophic region of the southwest Indian Ocean. Phase locked to austral summer, this sporadic feature exhibits substantial temporal and spatial variability. Several studies, with different hypotheses, have focused on the initiation mechanism triggering the bloom, but none has been as yet clearly substantiated. With 19 years of ocean color data set available as well as in situ measurements (Argo profiles), the time is ripe to review this feature. The bloom is characterized in a novel manner, and a new bloom index is suggested, yielding 11 bloom years, including 3 major bloom years (1999, 2006, and 2008). Spatially, the bloom varies from a mean structure (22–32°S; 50–70°E) both zonally and meridionally. A colocation analysis of Argo profiles and chlorophyll-a data revealed a bloom occurrence in a shallow-stratified layer, with low-salinity water in the surface layers. Additionally, a quantitative assessment of the previous hypotheses is performed and bloom occurrence is found to coincide with La Niña events and reduced upwelling intensity south of Madagascar. A stronger South-East Madagascar Current during La Niña may support a detachment of the current from the coasts, dampening the upwelling south of Madagascar, and feeding low-salinity waters into the Madagascar Basin, hence increasing stratification. Along with abundance of light, these provide the right conditions for a nitrogen-fixing cyanobacterial phytoplankton bloom onset
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2018JC014582
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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